Add following aspect ratios: 16:9, 21:9, Stretch to Window

Available as a drop down within the configure graphics tab.

src/yuzu_tester/config.cpp

@@ -118,6 +118,8 @@ void Config::ReadValues() {
     // Renderer
     Settings::values.resolution_factor =
         static_cast<float>(sdl2_config->GetReal("Renderer", "resolution_factor", 1.0));
+    Settings::values.aspect_ratio =
+        static_cast<int>(sdl2_config->GetInteger("Renderer", "aspect_ratio", 0));
     Settings::values.use_frame_limit = false;
     Settings::values.frame_limit = 100;
     Settings::values.use_disk_shader_cache =

src/yuzu_tester/default_ini.h

@@ -26,6 +26,10 @@ use_shader_jit =
 # factor for the Switch resolution
 resolution_factor =
 
+# Aspect ratio
+# 0: Default (16:9), 1: Force 21:9, 2: Stretch to Window
+aspect_ratio =
+
 # Whether to enable V-Sync (caps the framerate at 60FPS) or not.
 # 0 (default): Off, 1: On
 use_vsync =